Getting a good night’s sleep is a typical recommendation during times of stress, especially after a unsettling or traumatic experience. A new study, published in the Journal of Neuroscience , questions this standard thinking. Researchers at the University of Massachusetts at Amherst showed 106 participants unsettling images, then showed them again 12 hours later. Subjects who stayed awake during those 12 hours had less emotional reactivity to the same stimuli than did subjects who went to sleep—particularly those who had more time in REM sleep. The same pattern was noted for recognition accuracy 12 hours later—it was better in participants who slept than in those who didn’t. The study concludes that “sleep enhances emotional memory while preserving emotional reactivity.” “It is common to be sleep-deprived after witnessing a traumatic scene, almost as if your brain doesn't want to sleep on it," said Rebecca Spencer , one of the authors of the study. In fact, going to sleep may “lock in” the negative emotions associated with the traumatic event. Have you found this to be true in your practice? Do patients who get more rest after a negative event have a harder time recovering than those who get little sleep? Could insomnia be considered as a recommended treatment for people with PTSD?